<template>
    <!-- 商品分类导航 -->
    <div class="type-nav">
        <div class="container">
            <div @mouseenter="enterShow" @mouseleave="leaveShow">
                <h2 class="all">全部商品分类</h2>
                <!-- 三级联动 -->
                <transition name="sort">
                    <div class="sort" v-show="show">
                <div class="all-sort-list2" @click="goSearch">
                    <div class="item" v-for="(c1,index) in categoryList" :key="c1.categoryId">
                        <h3>
                            <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                        </h3>
                        <div class="item-list clearfix">
                            <div class="subitem" v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                                <dl class="fore">
                                    <dt>
                                        <!-- <a href="">{{c2.categoryName}}</a> -->
                                        <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                                    </dt>
                                    <dd>
                                        <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                                            <!-- <a href="">{{c3.categoryName}}</a> -->
                                            <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                                        </em>
                                    </dd>
                                </dl>
                            </div>
                        </div>
                    </div>
                </div>
                    </div>
                </transition>
            </div>
            <nav class="nav">
                <a href="###">服装城</a>
                <a href="###">美妆馆</a>
                <a href="###">尚品汇超市</a>
                <a href="###">全球购</a>
                <a href="###">闪购</a>
                <a href="###">团购</a>
                <a href="###">有趣</a>
                <a href="###">秒杀</a>
            </nav>
        </div>
    </div>
</template>

<script>
import {mapState} from 'vuex';
export default {
    name:'TypeNav',
    data() {
        return {
            show:true,
        }
    },
    mounted(){
        if(this.$route.path!='/home'){
            this.show = false;
        }
    },
    computed:{
        ...mapState({
            // 对象的写法：右侧需要的是一个函数，当使用计算属性的时候，右侧的函数会立即执行一次
            // 注入一个参数state，是大仓库中的数据
            categoryList: state=>state.home.categoryList.slice(0,15),
        })
    },
    methods:{
        // 进行路由跳转
        goSearch(event){
            // 获取到触发事件的节点
            let element = event.target;
            let {categoryname,category1id,category2id,category3id} = element.dataset;
            if(categoryname){
                // 整理路由跳转的参数
                let location = {name:'search'};
                let query = {categoryName:categoryname};
                if(category1id){
                    query.category1Id = category1id;
                }else if(category2id){
                    query.category2Id = category2id;
                }else{
                    query.category3Id = category3id;
                }
                // 判断是否存在params参数，如果存在也需要携带过去
                if(this.$route.params){
                    location.params = this.$route.params;
                    location.query = query;
                    // 路由跳转
                    this.$router.push(location);
                }
            }
        },
        // 当鼠标移入时，让商品分类列表展示
        enterShow(){
            this.show = true;
        },
        // 当鼠标移出时，让商品分类列表隐藏
        leaveShow(){
            if(this.$route.path!='/home'){
                this.show = false;
            }
        }
    }
}
</script>

<style scoped lang="less">
.type-nav {
    border-bottom: 2px solid #e1251b;

    .container {
        width: 1200px;
        margin: 0 auto;
        display: flex;
        position: relative;

        .all {
            width: 210px;
            height: 45px;
            background-color: #e1251b;
            line-height: 45px;
            text-align: center;
            color: #fff;
            font-size: 14px;
            font-weight: bold;
        }

        .nav {
            a {
                height: 45px;
                margin: 0 22px;
                line-height: 45px;
                font-size: 16px;
                color: #333;
            }
        }

        .sort {
            position: absolute;
            left: 0;
            top: 45px;
            width: 210px;
            height: 461px;
            position: absolute;
            background: #fafafa;
            z-index: 999;

            .all-sort-list2 {
                .item {
                    h3 {
                        line-height: 30px;
                        font-size: 14px;
                        font-weight: 400;
                        overflow: hidden;
                        padding: 0 20px;
                        margin: 0;

                        a {
                            color: #333;
                        }
                    }

                    .item-list {
                        display: none;
                        position: absolute;
                        width: 734px;
                        min-height: 460px;
                        background: #f7f7f7;
                        left: 210px;
                        border: 1px solid #ddd;
                        top: 0;
                        z-index: 9999 !important;

                        .subitem {
                            float: left;
                            width: 650px;
                            padding: 0 4px 0 8px;

                            dl {
                                border-top: 1px solid #eee;
                                padding: 6px 0;
                                overflow: hidden;
                                zoom: 1;

                                &.fore {
                                    border-top: 0;
                                }

                                dt {
                                    float: left;
                                    width: 54px;
                                    line-height: 22px;
                                    text-align: right;
                                    padding: 3px 6px 0 0;
                                    font-weight: 700;
                                }

                                dd {
                                    float: left;
                                    width: 415px;
                                    padding: 3px 0 0;
                                    overflow: hidden;

                                    em {
                                        float: left;
                                        height: 14px;
                                        line-height: 14px;
                                        padding: 0 8px;
                                        margin-top: 5px;
                                        border-left: 1px solid #ccc;
                                    }
                                }
                            }
                        }
                    }

                    &:hover {
                        .item-list {
                            display: block;
                        }
                    }
                }
                .item:hover {
                    background-color: skyblue;
                }
            }
        }

        // 过渡动画样式
        // 过渡动画进入的开始状态
        .sort-enter {
            height: 0px;
        }
        // 过渡动画进入的结束状态
        .sort-enter-to {
            height: 461px;
        }
        // 定义动画的时间、速率
        .sort-enter-active {
            transition: all .5s linear;
        }
    }
}
</style>